Inter-call device for telephone sets



FIG. 1 is a top, front and right side perspective view of an inter-calldevice for telephone sets showing my new design,

FIG. 2 is a top plan view thereof,

FIG. 3 is a front elevational view thereof,

FIG. 4 is a rear elevational view thereof,

FIG. 5 is a bottom plan view thereof,

FIG. 6 is a left side elevational view thereof.

The ornamental design for an inter-call device for telephone sets, asshown.